Lime wash plaster is a type of finish made from slaked lime, water, and natural pigments. It is applied to walls and surfaces to create a soft, matte finish that allows the substrate to breathe, making it ideal for historical buildings and environmentally conscious projects. Unlike modern paints, lime wash plaster is non-film forming, meaning it does not create a barrier on the surface, allowing moisture to escape and preventing mold growth.
Properties and Benefits
- Breathability: Lime wash plaster is highly breathable, which helps to regulate moisture levels in walls and improve indoor air quality. This property is particularly beneficial in preventing mold and mildew.
- Natural Aesthetic: It provides a unique, soft, and natural look that can age beautifully over time, developing a patina that enhances the character of the building.
- Eco-Friendly: Made from natural materials, lime wash plaster is low in VOCs (volatile organic compounds) and is a sustainable choice for building finishes.
- Durability: While not as durable as some modern finishes, lime wash can last for many years (typically 10-12 years) before requiring touch-ups, especially in exterior applications.
Applications
Lime wash plaster can be applied to a variety of surfaces, including:
- Cement Render: It adheres well to cement-based surfaces, providing a beautiful finish.
- Brick and Stone: Suitable for unglazed bricks, sandstone, and other absorbent materials.
- Interior and Exterior Use: While traditionally used for exteriors, some formulations are suitable for interior applications as well.
Application Process
Applying lime wash plaster typically requires some skill, especially for finer finishes. Here are the general steps:
- Preparation: Ensure the surface is clean and free of dust or debris.
- Mixing: Prepare the lime wash according to the manufacturer's instructions, ensuring a smooth consistency.
- Application: Use a brush, roller, or sprayer to apply the lime wash evenly. Multiple coats may be necessary, with drying time between applications.
- Finishing: Depending on the desired finish, additional techniques like burnishing may be applied to enhance sheen and texture.
Conclusion
Lime wash plaster is a versatile and attractive option for both interior and exterior finishes. Its natural properties and aesthetic appeal make it a popular choice for those looking to achieve a timeless look while maintaining the health of their building materials. For best results, consider hiring a skilled artisan familiar with lime products to ensure proper application and finish quality.